SSD + Full Disk Encryption = Slow/Slower as HDD

Got a chance to test Intel X25-M G2 160Gb SSD; Dropped it in a laptop , Dell Latitude E6400/2Gb as well as Dell Precision/X5560/4Gb system. The desktop was run unencrypted, the laptop tests were run with full disk encryption (Utimaco Safeguard Enterprise).